Battery charger



FIG. 1 is a right/front perspective view of a battery charger.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines are for purposes of illustrating environmental structure. The broken lines and the structure they depict form no part of the claimed design. 

The ornamental design for a battery charger, as shown and described. 